INFO: task syz.3.637:11452 blocked for more than 143 seconds.
Tainted: G W 6.16.0-syzkaller-11489-gd2eedaa3909b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.637 state:D stack:26024 pid:11452 tgid:11451 ppid:5846 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153
kthread_flush_worker+0x1c6/0x240 kernel/kthread.c:1563
__alloc_workqueue+0x146b/0x1b70 kernel/workqueue.c:5763
alloc_workqueue_noprof+0xd4/0x210 kernel/workqueue.c:5786
btrfs_init_workqueues+0x225/0x6c0 fs/btrfs/disk-io.c:1983
open_ctree+0x11ef/0x3a10 fs/btrfs/disk-io.c:3424
btrfs_fill_super fs/btrfs/super.c:977 [inline]
btrfs_get_tree_super fs/btrfs/super.c:1937 [inline]
btrfs_get_tree_subvol fs/btrfs/super.c:2074 [inline]
btrfs_get_tree+0xf55/0x1820 fs/btrfs/super.c:2108
vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805
do_mount fs/namespace.c:4133 [inline]
__do_sys_mount fs/namespace.c:4344 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4321
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a0496030a
RSP: 002b:00007f0a027bde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0a027bdef0 RCX: 00007f0a0496030a
RDX: 0000200000000000 RSI: 00002000000015c0 RDI: 00007f0a027bdeb0
RBP: 0000200000000000 R08: 00007f0a027bdef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000015c0
R13: 00007f0a027bdeb0 R14: 000000000000559e R15: 0000200000000040
Showing all locks held in the system:
1 lock held by khungtaskd/39:
#0: ffffffff8d9a8bc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8d9a8bc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8d9a8bc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:3/57:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc9000123fbc0 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000123fbc0 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
4 locks held by kworker/u8:15/993:
2 locks held by kworker/u8:16/994:
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888019881138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3319
#1: ffffc900046efbc0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc900046efbc0 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3319
2 locks held by getty/5599:
#0: ffff88823bf840a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222
2 locks held by kworker/1:3/5827:
1 lock held by syz-executor/5837:
#0: ffff8880607940d0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880607940d0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880607940d0 (&type->s_umount_key#67){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
2 locks held by syz-executor/5843:
#0: ffff88806161a0d0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88806161a0d0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88806161a0d0 (&type->s_umount_key#67){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:506
#1: ffff88802ed7d088 (&ailp->ail_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#1: ffff88802ed7d088 (&ailp->ail_lock){+.+.}-{3:3}, at: xfs_ail_push_all_sync+0x1d5/0x2a0 fs/xfs/xfs_trans_ail.c:722
1 lock held by syz.3.637/11452:
#0: ffff888061ae00d0 (&type->s_umount_key#61/1){+.+.}-{4:4}, at: alloc_super+0x204/0x990 fs/super.c:345
1 lock held by syz.6.801/13544:
2 locks held by syz.0.802/13548:
1 lock held by xfsaild/loop4/13563:
#0: ffff88802ed7d088 (&ailp->ail_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
#0: ffff88802ed7d088 (&ailp->ail_lock){+.+.}-{3:3}, at: xfsaild_push fs/xfs/xfs_trans_ail.c:492 [inline]
#0: ffff88802ed7d088 (&ailp->ail_lock){+.+.}-{3:3}, at: xfsaild+0x68d/0x2950 fs/xfs/xfs_trans_ail.c:700
4 locks held by syz.5.803/13565:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 39 Comm: khungtaskd Tainted: G W 6.16.0-syzkaller-11489-gd2eedaa3909b #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf93/0xfe0 kernel/hung_task.c:491
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5827 Comm: kworker/1:3 Tainted: G W 6.16.0-syzkaller-11489-gd2eedaa3909b #0 PREEMPT_{RT,(full)}
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: xfs-buf/loop4 xfs_buf_ioend_work
RIP: 0010:__bfs kernel/locking/lockdep.c:1815 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain+0xfd7/0x2140 kernel/locking/lockdep.c:3908
Code: 25 ff 0f 00 00 39 05 04 a2 60 11 73 06 89 05 fc a1 60 11 49 8b 04 24 48 89 de 48 39 e8 0f 84 33 fe ff ff 4c 89 68 30 48 8b 00 <48> 39 e8 75 f4 48 89 de e9 1f fe ff ff 48 c7 c7 90 91 87 8d 48 89
RSP: 0018:ffffc90004ddf588 EFLAGS: 00000002
RAX: ffffffff95aedc88 RBX: 0000000000000100 RCX: 0000000000000002
RDX: 0000000000000008 RSI: 0000000000000100 RDI: ffff888033b48000
RBP: ffffffff929e0fc8 R08: ffffc90004ddf550 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff819c60c0 R12: ffffffff95807a58
R13: ffffc90004ddf610 R14: ffff888033b48b98 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881269cd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe56eb08000 CR3: 000000006fc5a000 CR4: 00000000003526f0
Call Trace:
__lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
mark_wakeup_next_waiter kernel/locking/rtmutex.c:1319 [inline]
rt_mutex_slowunlock+0x181/0x8a0 kernel/locking/rtmutex.c:1466
spin_unlock include/linux/spinlock_rt.h:105 [inline]
xfs_ail_update_finish+0x137/0x160 fs/xfs/xfs_trans_ail.c:775
xfs_iflush_ail_updates fs/xfs/xfs_inode_item.c:958 [inline]
xfs_buf_inode_iodone+0x7af/0xd20 fs/xfs/xfs_inode_item.c:1037
__xfs_buf_ioend+0x2d9/0x6f0 fs/xfs/xfs_buf.c:1205
xfs_buf_ioend_work+0x1c/0x50 fs/xfs/xfs_buf.c:1232
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245